Two-stage actuator control device

Details Two-stage actuator control device Two-stage actuator control device

1994-06-06

1995-09-19

Sugarman, Scott J.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4435, 360 7805, 31856817, 31856818, G11B 5596

Patent

active

054522757

ABSTRACT:
The two-stage actuator control device comprises a first actuator which can be driven in a small operating range and at high frequencies, a drive circuit for driving the first actuator, a second actuator which can be driven in a large operating range and at low frequencies, a drive circuit for driving the second actuator, a low pass filter for separating the operating regions of the two actuators, a position detector for detecting the relative position of the first actuator with respect to the second actuator, and a differentiator for differentiating the position signal of the position detector, in which the output of the differentiator is fed back to the input of the first actuator drive circuit 2. Thereby, the stability of the two-stage actuator control device is improved.

REFERENCES:
patent: 4748392 (1988-05-01), Fincher et al.
patent: 4755977 (1988-07-01), Abed
patent: 5090001 (1992-02-01), Ito et al.
"A Two-Stage Coupling Servo System for an Optical Disc Memory" Theses of the Optical Memory Symposium, 1985. pp. 203-208.
"Tracking Servo for Small Size Optical Disk System"; Nomura et al.; C&C Systems Research Laboratories, NEC Corp.

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